Eusebius

Eusebius (260-339) was Bishop of Caesarea Maritima from 313 to 339, succeeding Agapius and preceding Acacius), a historian of Christianity, and a scholar of the Biblical canon.

Biography
Eusebius was a student of the Biblical scholar Pamphilus during the 280s, and he began to work on his Ecclesiastical History during the 290s, completing its first editions before 300. He became Bishop of Caesarea Maritima in 313 and rose to become metropolitan of all Palestine, and he was placed under conditional excommunication from the Council of Antioch for his support of Arius. However, he was a favorite of Constantine the Great, and he wrote the Life of Constantine after Constantine's death in 337. He died in 339.